Electrical bussiness logo

This is what RFB ELECTRICAL was looking for in their logo design

RFB ELECTRICAL is an electrical contracting business in need of a vibrant logo for use on business cards, advertising, workwear and company vehicles. The logo must be able to be viewed effectively in all formats on very small items and on a variety of backgrounds.

I am open minded to different designs, but feel as "RFB" should be the main focus to the design. and "electrical" as a sub text.

once again got an open mind to the usual images associated with electrical such as lightening bolts, light bulb, power points, etc, But I also like a neat, professional look (RFB in one color text and perhaps and bigger text and electrical in a smaller or different color text). Or something like an extension cord coming out of one of the letters or a lighting bolt.
I also seen the "on" symbol etc used within text when bubble type lettering is used.

preferable colours
-blue, white, red
- grey and orange
- green and grey
-blue and grey

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